The Universal Clamp is a complete mounting system that comes standard with a brushed clear coated aluminum finish, 1.9" and 2.375" standard plastic inserts, and stainless steel hardware. The Universal Clamp is compatible with most Roswell board racks, marine audio, & towers on the market. EACH SOLD SEPARATELY Includes: 1.9" and 2.375" plastic inserts Compatible with most Roswell product